用超导点接触测量金属的自旋极化
Measuring the spin polarization of a metal with a superconducting point contact.
作者信息
Byers JM, Osofsky MS, Nadgorny B, Ambrose T, Cheng SF, Nowak J, Moodera JS, Barry A, Coey JMD
机构信息
R. J. Soulen Jr., M. S. Osofsky, B. Nadgorny, T. Ambrose, S. F. Cheng, P. R. Broussard, Materials Physics, Naval Research Laboratory, Washington, DC 20375, USA. J. M. Byers, Department of Physics, George Washington University, Washington, DC 2.
出版信息
Science. 1998 Oct 2;282(5386):85-8. doi: 10.1126/science.282.5386.85.
A superconducting point contact is used to determine the spin polarization at the Fermi energy of several metals. Because the process of supercurrent conversion at a superconductor-metal interface (Andreev reflection) is limited by the minority spin population near the Fermi surface, the differential conductance of the point contact can reveal the spin polarization of the metal. This technique has been applied to a variety of metals where the spin polarization ranges from 35 to 90 percent: Ni0.8Fe0.2, Ni, Co, Fe, NiMnSb, La0.7Sr0.3MnO3, and CrO2.
一种超导点接触被用于确定几种金属在费米能处的自旋极化。由于超导体 - 金属界面处的超电流转换过程（安德烈夫反射）受费米面附近少数自旋态载流子数量的限制，点接触的微分电导能够揭示金属的自旋极化。该技术已应用于多种自旋极化率在35%至90%之间的金属：Ni0.8Fe0.2、Ni、Co、Fe、NiMnSb、La0.7Sr0.3MnO3和CrO2。
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